I recently re-organised partitions and ended up at rescue grub on rebooting.

I have changed the fstab to accord with Gparted reports on the partitions and changed the /dev/sdaX and (hd0,msdosX) values in the boot config file.
But when re-booting I still have to set prefix and root to the correct (hd0.X) values. All the examples of grub building shew "for example (hd0,msdosX)"

Since I no longer have an MS partition and boot is in the linux / directory should I change all the (hd0,msdosX) points in the config file to (hd0,X)?

It seems the obvious solution but I hesitate in case grub is somehow tied up with msdos.

After spending a few hours with that and trying to set up a new boot partition I now get 1234F: after booting. All the refs I can find need to use a usb connection which I don't have - part of the reason I'm in this mess. Any idea how I can get my bios repaired to enable usb booting! Samsung tech help don't respond.